/**
 * Eclipse Outliner
 * Copyright (C) 2006 Jeff Mesnil
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
package net.jmesnil.outliner.ui.internal;

import net.jmesnil.opml.core.IBody;
import net.jmesnil.opml.core.IOutline;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

public class OutlinerContentProvider implements IStructuredContentProvider,
        ITreeContentProvider {
    public OutlinerContentProvider() {
    }

    public void inputChanged(Viewer v, Object oldInput, Object newInput) {
    }

    public void dispose() {
    }

    public Object[] getElements(Object input) {
        if (input instanceof IBody) {
            IBody body = (IBody) input;
            return body.getChildren();
        }
        return null;
    }

    public Object[] getChildren(Object parent) {
        if (parent instanceof IOutline) {
            IOutline outline = (IOutline) parent;
            return outline.getChildren();
        }
        return null;
    }

    public Object getParent(Object element) {

        if (element instanceof IOutline) {
            IOutline outline = (IOutline) element;
            return outline.getParent();
        }
        return null;
    }

    public boolean hasChildren(Object element) {
        if (element instanceof IOutline) {
            IOutline outline = (IOutline) element;
            return outline.getChildren().length > 0;
        }
        return false;
    }

}